Table 2.

Demographic and clinical factors associated with gender (n = 12 759)

Variable	Adjusted ORa (female versus male)	95% CI
Age (years)
<50	1.00	Ref
50–59	0.72	0.54–0.97
60–69	0.43	0.32–0.58
70–79	0.43	0.32–0.58
≥80	0.49	0.36–0.66
Race
White	1.00	Ref
Black	1.00	0.80–1.24
Asian/Other	1.15	0.87–1.53
Spanish/Hispanic origin
Yes versus No	0.99	0.79–1.2
% of adults in patient zip code without a HS degree (quartiles)
<7	1.00	Ref
7–12.9	0.86	0.76–0.97
13–20.9	0.96	0.83–1.11
≥21	0.96	0.80–1.17
Patient zip code median income ($) (quartiles)
≥63 000	1.00	Ref
48 000–62 999	0.97	0.86–1.09
38 000–47 999	0.90	0.78–1.04
<38 000	0.93	0.78–1.12
Insurance
Medicare/other government	1.00	Ref
Medicaid	1.42	1.08–1.89
Private insurance	1.11	0.98–1.25
Uninsured	0.98	0.71–1.36
Charlson Comorbidity Index
0	1.00	Ref
1	0.89	0.80–0.99
≥2	0.76	0.65–0.90
Facility type
Community Cancer Program	1.00	Ref
Academic/Integrated Network Cancer Program	1.04	0.95–1.14
Distance from patient to reporting facility (miles)
<25	1.00	Ref
25–49.9	0.96	0.84–1.11
≥50	0.89	0.77–1.03
Histology
Epithelial	1.00	Ref
Sarcomatoid	0.50	0.42–0.59
Biphasic	0.68	0.57–0.82
Not otherwise specified	0.93	0.84–1.02
Laterality
Bilateral involvement/midline versus one side	0.85	0.65–1.13
Stage
Local	1.00	Ref
Regional	1.08	0.96–1.23
Distant	1.07	0.93–1.21
Missing/unknown	1.05	0.94–1.18
Surgery
Yes versus No	0.91	0.81–1.04
Radiotherapy
Yes versus No	1.07	0.85–1.35
Chemotherapy
Yes versus No	0.78	0.71–0.86

HS, high school; OR, odds ratio.

^{a a}Odds of being female, adjusted for all other variables, year of diagnosis, and reporting facility census division.Bold values indicate statistically significant results.